Datang Telecom Technology Co., Ltd. (SHSE:600198) shareholders are no doubt pleased to see that the share price has bounced 26% in the last month, although it is still struggling to make up recently lost ground. Unfortunately, the gains of the last month did little to right the losses of the last year with the stock still down 18% over that time.

After such a large jump in price, Datang Telecom Technology may be sending strong sell signals at present with a price-to-sales (or "P/S") ratio of 7.6x, when you consider almost half of the companies in the Communications industry in China have P/S ratios under 4.2x and even P/S lower than 2x aren't out of the ordinary. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/S.

How Has Datang Telecom Technology Performed Recently?

For instance, Datang Telecom Technology's receding revenue in recent times would have to be some food for thought. One possibility is that the P/S is high because investors think the company will still do enough to outperform the broader industry in the near future. You'd really hope so, otherwise you're paying a pretty hefty price for no particular reason.

How Is Datang Telecom Technology's Revenue Growth Trending?

The only time you'd be truly comfortable seeing a P/S as steep as Datang Telecom Technology's is when the company's growth is on track to outshine the industry decidedly.

Taking a look back first, the company's revenue growth last year wasn't something to get excited about as it posted a disappointing decline of 13%. This means it has also seen a slide in revenue over the longer-term as revenue is down 23% in total over the last three years. So unfortunately, we have to acknowledge that the company has not done a great job of growing revenue over that time.

In contrast to the company, the rest of the industry is expected to grow by 52% over the next year, which really puts the company's recent medium-term revenue decline into perspective.

With this in mind, we find it worrying that Datang Telecom Technology's P/S exceeds that of its industry peers. Apparently many investors in the company are way more bullish than recent times would indicate and aren't willing to let go of their stock at any price. There's a very good chance existing shareholders are setting themselves up for future disappointment if the P/S falls to levels more in line with the recent negative growth rates.

The Bottom Line On Datang Telecom Technology's P/S

Datang Telecom Technology's P/S has grown nicely over the last month thanks to a handy boost in the share price. Generally, our preference is to limit the use of the price-to-sales ratio to establishing what the market thinks about the overall health of a company.

Our examination of Datang Telecom Technology revealed its shrinking revenue over the medium-term isn't resulting in a P/S as low as we expected, given the industry is set to grow. Right now we aren't comfortable with the high P/S as this revenue performance is highly unlikely to support such positive sentiment for long. Should recent medium-term revenue trends persist, it would pose a significant risk to existing shareholders' investments and prospective investors will have a hard time accepting the current value of the stock.

The company's balance sheet is another key area for risk analysis. Our free balance sheet analysis for Datang Telecom Technology with six simple checks will allow you to discover any risks that could be an issue.

If strong companies turning a profit tickle your fancy, then you'll want to check out this free list of interesting companies that trade on a low P/E (but have proven they can grow earnings).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.